Structural Design Specifications - Engineering

Q1:

If fck is the characteristic cube strength of concrete in N/mm2, the modulus of elasticity of structural concrete Ec = afck where the value of a, is

A 5900

B 5800

C 5700

D 5600

E 5500

ANS:C - 5700

In limit state method it is 5000.

The working stress method it is 5700.